Morphology of Composite Fe@Au Submicron Particles, Produced with Ultrasonic Spray Pyrolysis and Potential for Synthesis of Fe@Au Core–Shell Particles

Iron core–gold shell (Fe@Au) nanoparticles are prominent for their magnetic and optical properties, which are especially beneficial for biomedical uses. Some experiments were carried out to produce Fe@Au particles with a one-step synthesis method, Ultrasonic Spray Pyrolysis (USP), which is able to produce the particles in a continuous process. The Fe@Au particles were produced with USP from a precursor solution with dissolved Iron (III) chloride and Gold (III) chloride, with Fe/Au concentration ratios ranging from 0.1 to 4. The resulting products are larger Fe oxide particles (mostly maghemite Fe2O3), with mean sizes of about 260–390 nm, decorated with Au nanoparticles (AuNPs) with mean sizes of around 24–67 nm. The Fe oxide core particles are mostly spherical in all of the experiments, while the AuNPs become increasingly irregular and more heavily agglomerated with lower Fe/Au concentration ratios in the precursor solution. The resulting particle morphology from these experiments is caused by surface chemistry and particle to solvent interactions during particle formation inside the USP system.

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Synthesis of Silica Particles Using Ultrasonic Spray Pyrolysis Method

Metals ◽

10.3390/met11030463 ◽

2021 ◽

Vol 11 (3) ◽

pp. 463

Author(s):

Srecko Stopic ◽

Felix Wenz ◽

Tatjana-Volkov Husovic ◽

Bernd Friedrich

Keyword(s):

Spray Pyrolysis ◽

Sol Gel ◽

Ultrasonic Spray Pyrolysis ◽

Silica Particles ◽

Cement Industry ◽

Submicron Particles ◽

Spherical Particles ◽

Spray Pyrolysis Method ◽

X Ray ◽

Ultrasonic Spray

Silica has sparked strong interest in hydrometallurgy, catalysis, the cement industry, and paper coating. The synthesis of silica particles was performed at 900 °C using the ultrasonic spray pyrolysis (USP) method. Ideally, spherical particles are obtained in one horizontal reactor from an aerosol. The controlled synthesis of submicron particles of silica was reached by changing the concentration of precursor solution. The experimentally obtained particles were compared with theoretically calculated values of silica particles. The characterization was performed using a scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS). X-ray diffraction, frequently abbreviated as XRD, was used to analyze the structure of obtained materials. The obtained silica by ultrasonic spray pyrolysis had an amorphous structure. In comparison to other methods such as sol–gel, acidic treatment, thermal decomposition, stirred bead milling, and high-pressure carbonation, the advantage of the ultrasonic spray method for preparation of nanosized silica controlled morphology is the simplicity of setting up individual process segments and changing their configuration, one-step continuous synthesis, and the possibility of synthesizing nanoparticles from various precursors.

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Dried plum-like ZnO assemblies consisted of ZnO nanoparticles synthesized by ultrasonic spray pyrolysis

International Journal of Modern Physics B ◽

10.1142/s0217979220400056 ◽

2019 ◽

Vol 34 (01n03) ◽

pp. 2040005 ◽

Cited By ~ 1

Author(s):

Congzhi Zhang ◽

Tao Han ◽

Wei Wang ◽

Jin Zhang

Keyword(s):

Electron Microscopy ◽

Spray Pyrolysis ◽

Field Emission ◽

Zno Nanoparticles ◽

Ultrasonic Spray Pyrolysis ◽

Precursor Solution ◽

Spray Pyrolysis Method ◽

X Ray Diffraction ◽

Ultrasonic Spray ◽

Transmission Electron

Dried plum-like ZnO assemblies consisting ZnO nanoparticles were synthesized by an ultrasonic spray pyrolysis method (USP). ZnO assemblies were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS) and field-emission transmission electron microscopy (TEM). The results show the size of ZnO assemblies is in the range of 300–870 nm, and that of ZnO nanoparticles is from 33 nm to 39 nm. The microstructure and size of ZnO assemblies were successfully controlled by the concentration of the precursor solution.

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Formation of Non-Toxic Au Nanoparticles with Bimodal Size Distribution by a Modular Redesign of Ultrasonic Spray Pyrolysis

Nanoscience and Nanotechnology Letters ◽

10.1166/nnl.2015.2046 ◽

2015 ◽

Vol 7 (11) ◽

pp. 920-929 ◽

Cited By ~ 10

Author(s):

Peter Majerič ◽

Darja Jenko ◽

Bojan Budič ◽

Sergej Tomić ◽

Miodrag Čolić ◽

...

Keyword(s):

Spray Pyrolysis ◽

Size Distribution ◽

Au Nanoparticles ◽

Ultrasonic Spray Pyrolysis ◽

Bimodal Size Distribution ◽

Ultrasonic Spray

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The roles of ammonia and ammonium bicarbonate in the preparation of nickel particles from nickel chloride

Journal of Materials Research ◽

10.1557/jmr.2000.0311 ◽

2000 ◽

Vol 15 (10) ◽

pp. 2157-2166 ◽

Cited By ~ 18

Author(s):

B. Xia ◽

I. W. Lenggoro ◽

K. Okuyama

Keyword(s):

Aqueous Solution ◽

Spray Pyrolysis ◽

Reaction Pathway ◽

Ultrasonic Spray Pyrolysis ◽

Precursor Solution ◽

Nickel Chloride ◽

Ammonium Bicarbonate ◽

Solution Chemistry ◽

Ultrasonic Spray ◽

Nickel Particles

The roles of NH3 · H2O and NH4HCO3 in the preparation of Ni particles from NiCl2 · 6H2O aqueous solution by ultrasonic spray pyrolysis were investigated. The results showed that both ammonia and ammonium bicarbonate had a remarkable influence on the solution chemistry and the resulting particles, and could significantly modify the reaction pathway. After the addition of these additives to the precursor solution, intermediate NiO was formed initially, followed by reduction to metallic Ni in the presence of a reductive gas. H2 is a powerful reducing agent; however, metallic Ni could also be obtained in the absence of H2 in the carrier gas. In the latter case, it was shown that NH3 was primarily responsible for Ni formation. A description of the mechanisms and processes of Ni formation during spray pyrolysis is proposed.

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Enhanced Visible and Ultraviolet Light-Induced Gas-Phase Photocatalytic Activity of TiO2 Thin Films Modified by Increased Amount of Acetylacetone in Precursor Solution for Spray Pyrolysis

Catalysts ◽

10.3390/catal10091011 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1011

Author(s):

Jekaterina Spiridonova ◽

Arvo Mere ◽

Malle Krunks ◽

Merilin Rosenberg ◽

Anne Kahru ◽

...

Keyword(s):

Thin Films ◽

Photocatalytic Activity ◽

Spray Pyrolysis ◽

Flow Reactor ◽

Ultrasonic Spray Pyrolysis ◽

Precursor Solution ◽

Molar Ratio ◽

Tio2 Thin Films ◽

Ultrasonic Spray ◽

Great Possibility

TiO2 thin films, modified by acetylacetone (AcacH) in solution, were deposited on glass substrate by ultrasonic spray pyrolysis and tested for photocatalytic activity in a multi-section continuous flow reactor by degradation of acetone and acetaldehyde under ultraviolet and visible light. The increase in molar ratio of AcacH in respect of titanium (IV) isopropoxide (TTIP) from 1:5 to 1:8 modified the electronic structure of the films, favoring enhanced photocatalytic activity. The photocatalytic activity was enhanced approximately twofold on the film with molar ratio 1:8 under both irradiations; the film completely oxidized 10 ppm of acetone and acetaldehyde. The photocatalytic efficacy of TiO2 films in oxidation of air pollutants was three times higher compared to the industrial glass Pilkington ActivTM. Moreover, all the synthesized films indicate antibacterial efficiency against E. coli of over 99% under ultraviolet. TiO2 film, with TTIP:AcacH molar ratio 1:8 having great possibility for its commercial use as a material for indoor air purification.

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Impact of precursor solution concentration to form superparamagnetic MgFe2O4 nanospheres by ultrasonic spray pyrolysis technique for magnetic thermotherapy

Advanced Powder Technology ◽

10.1016/j.apt.2017.04.007 ◽

2017 ◽

Vol 28 (7) ◽

pp. 1696-1703 ◽

Cited By ~ 9

Author(s):

Harinarayan Das ◽

Nipa Debnath ◽

Atsushi Toda ◽

Takahiko Kawaguchi ◽

Naonori Sakamoto ◽

...

Keyword(s):

Spray Pyrolysis ◽

Spray Pyrolysis Technique ◽

Ultrasonic Spray Pyrolysis ◽

Precursor Solution ◽

Solution Concentration ◽

Ultrasonic Spray Pyrolysis Technique ◽

Ultrasonic Spray ◽

Precursor Solution Concentration

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SYNTHESIS OF GOLD NANOPARTICLES THROUGH ULTRASONIC SPRAY PYROLYSIS AND ITS APPLICATION IN PRINTED ELECTRONICS

Contemporary Materials ◽

10.7251/comen1801106r ◽

2018 ◽

Vol 9 (1) ◽

Author(s):

Rebeka Rudolf ◽

Mohammed Shariq ◽

Valentina Veselinovic ◽

Tijana Adamovic ◽

Rajko Bobovnik ◽

...

Keyword(s):

Gold Nanoparticles ◽

Spray Pyrolysis ◽

Process Parameters ◽

Printed Electronics ◽

Ultrasonic Spray Pyrolysis ◽

Precursor Solution ◽

Second Step ◽

Synthesis Mechanism ◽

Ultrasonic Spray ◽

Edx Analyses

This work presents a review of Ultrasonic Spray Pyrolysis (USP) as a technique for the synthesis of gold nanoparticle (AuNPs). The synthesis mechanism involved the preparation of the precursor solution from Au (III) Acetate and the study of the process parameters. AuNPs were characterized with different techniques, such as DLS, UV-vis and SEM-EDX analyses. In the second step, the AuNPs` ink was prepared with the following procedure: (i) Concentration of the AuNPs through Rotavapor, (ii) Filtration of the concentrated AuNPs through Amicon Ultra 15 Centrifugal Filters. Then, it was used directly for printing on an Ag plate. In the final part, we present some information about AuNPs` future applications, which could be in printed electronics with conducted patterns.

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